When checking whether the column exists, an error is reported

Question

$sql="select count(*) from cat where catname=$cat[catname]";

    $rs=mysql_query($sql);

    if(@mysql_fetch_row($rs)[0]!=0){

    echo "栏目存在";

    exit();

    };

Answer 1

Post the error message

Answer 2

$cat[catname] Is this an array? The content in [] should be enclosed in quotation marks

$sql="select count(*) from cat where catname=$cat['catname']";